fluorine mass number

Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. Lead is widely used as a gamma shield. The Cookies Statement is part of our Privacy Policy. The chemical symbol for Lead is Pb. The chemical symbol for Nickel is Ni. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. Ordinary substances like wood and rubber burst into flame when held into a stream of fluorine. Under standard conditions, it is the lightest metal and the lightest solid element. 1)an atom has a mass number of 27 and 14 neutrons. Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. The misspelling is common, but the "u" comes before the "o" in both. Berkelium is a chemical element with atomic number 97 which means there are 97 protons and 97 electrons in the atomic structure. What is the mass # of a fluorine atom with 8 neutrons? Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. Sodium is a soft, silvery-white, highly reactive metal. The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. 1)an atom has a mass number of 27 and 14 neutrons. It is even less abundant than the so-called rare earths. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. These two forces compete, leading to various stability of nuclei. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Discoverer: Ramsey, Sir William and Cleve, Per Teodor. It is the lightest element in the halogen family. What is the mass (D) of one atom of 19F?What would be the mass (g) of this one atom of 19F?What would be the mass of 10 atoms of 19F? Density of Fluorine. The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. The chemical symbol for Calcium is Ca. Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure. Fluorine is the most powerfully oxidizing element. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. asked by anon on August 29, 2011 basic chem 1)an atom has a mass number of 27 and 14 neutrons. The bulk properties of astatine are not known with any certainty. Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure. See also: Mass Number. It is part of the Group 7 on the periodic table of elements. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. It is fairly soft and slowly tarnishes in air. Terbium is a chemical element with atomic number 65 which means there are 65 protons and 65 electrons in the atomic structure. Carbon is the 15th most abundant element in the Earth’s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. The chemical symbol for Californium is Cf. Bromine is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Fluorine is a non metal element. 1) You may use almost everything for non-commercial and educational use. It has atomic number 9 and atomic symbol F and is the first of the halogens, which are the group 17 elements. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z. The chemical symbol for Curium is Cm. Chhapa ke gallery. In the manufacture of hydrogen fluoride (HF), powdered fluorspar is distilled with concentrated sulfuric acid in a lead or cast-iron apparatus. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. As a result, as the number of protons increases, an increasing ratio of neutrons to protons is needed to form a stable nucleus. It is one of the least reactive chemical elements and is solid under standard conditions. In nuclear industry gadolinium is commonly used as a neutron absorber due to very high neutron absorbtion cross-section of two isotopes 155Gd and 157Gd. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. It is the heaviest essential mineral nutrient. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. 2)The atomic number of fluorine is 9. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. Calculating Number of Neutrons: If we know the number of protons and the mass number of an element, we can also calculate the number of neutrons simply by subtracting its atomic number from its mass number. Platinum is one of the least reactive metals. Properties: Fluorine has a melting point of -219.62°C (1 atm), boiling point of -188.14°C (1 atm), density of 1.696 g/l (0°C, 1 atm), specific gravity of liquid of 1.108 at its boiling point, and valence of 1.Fluorine is a corrosive pale yellow gas. According to the Einstein relationship (E=mc2), this binding energy is proportional to this mass difference and it is known as the mass defect. F2 is a pale yellow-greenish colour gas and it has a melting point of -219 °C and a boiling point of -188 °C. The number of electrons in a neutral atom is equal to the number of protons. 1)an atom has a mass number of 27 and 14 neutrons. Molar mass of F = 18.9984032 g/mol. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. The chemical symbol for Zirconium is Zr. I know that fluorine atom is just plain Fluorine on the periodic table, but now its asking me for the atomic number of Fluorine ION. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. Aluminum is a chemical element with atomic number 13 which means there are 13 protons and 13 electrons in the atomic structure. The chemical symbol for Samarium is Sm. Neodymium is a soft silvery metal that tarnishes in air. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. Although neodymium is classed as a rare earth, it is a fairly common element. Tellurium is chemically related to selenium and sulfur. How many neutrons does fluorine have? Einsteinium is the seventh transuranic element, and an actinide. The mass number of fluorine-19 is 18.998404 amu. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. See also: Atomic Mass Number – Does it conserve in a nuclear reaction? The chemical symbol for Arsenic is As. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom—the Na+ cation. Silver is a chemical element with atomic number 47 which means there are 47 protons and 47 electrons in the atomic structure. We use cookies to ensure that we give you the best experience on our website. The chemical symbol for Helium is He. The mass number of the atom goes above the symbol and the atomic number is written as a subscript. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins. Arsenic is a metalloid. Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles. fluorine-18 atom: ChEBI ID CHEBI:36939: Definition The radioactive isotope of fluorine with relative atomic mass 18.000938. In nuclear reactors, promethium equilibrium exists in power operation. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. The chemical symbol for Indium is In. Europium is one of the least abundant elements in the universe. The chemical symbol for Rhenium is Re. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure. Berkelium is a member of the actinide and transuranium element series. Mass number is found by adding the number of protons and neutrons. Bromine is a chemical element with atomic number 35 which means there are 35 protons in its nucleus.Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z.The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. It is part of the Group 7 on the periodic table of elements. Caesium has physical and chemical properties similar to those of rubidium and potassium. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. To find the weight of a fluorine atom in grams, take the atomic weight of fluorine … The chemical symbol for Boron is B. The chemical symbol for Radium is Ra. These condensers use tubes that are usually made of stainless steel, copper alloys, or titanium depending on several selection criteria (such as thermal conductivity or corrosion resistance). The chemical symbol for Einsteinium is Es. Answer: 2 question What mass of xenon tetrafluoride, xef 4 , has the same number of fluorine atoms as 25.0 g of oxygen difluoride, of2? It is a pale yellow to greenish gas, with an irritating pungent odour. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. Fermium is a member of the actinide series. The chemical symbol for Berkelium is Bk. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. Fluorine (symbol F) ek chemical element hae jiske atomic number 9, aur atomic mass 19 hae. The chemical symbol for Promethium is Pm. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. Mass number (or) Atomic Mass (A): Total number of protons and neutrons present in the nucleus. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. Among isotopes of fluorine, F-17 is not a stable isotope and it has a half-life of 1.8 hours. On the other hand, nuclei with an odd number of protons and neutrons are mostly unstable. Carbon is one of the few elements known since antiquity. To determine the stability of an isotope you can use the ratio neutron/proton (N/Z). Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. The chemical symbol for Rubidium is Rb. When we use data that are related to certain product, we use only data released by public relations departments and allowed for use. Properties of atomic nuclei (atomic mass, nuclear cross-sections) are determined by the number of protons and number of neutrons (neutron number). Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. The chemical symbol for Francium is Fr. The chemical symbol for Tellurium is Te. The chemical symbol for Osmium is Os. Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. The chemical symbol for Manganese is Mn. Neptunium metal is silvery and tarnishes when exposed to air. The chemical symbol for Bismuth is Bi. If we add neutron, atomic number is not going to change, so it still would be Fluorine, but isotope of Fluorine with different atomic mass that would be equal 20. Discoverer: Priestley, Joseph and Scheele, Carl Wilhelm, Discoverer: Ramsay, William and Travers, Morris, Discoverer: Ramsay, Sir William and Strutt, John (Lord Rayleigh), Discoverer: Del Rio, Andrés Manuel (1801) and Sefström, Nils Gabriel (1830), Discoverer: Lecoq de Boisbaudran, Paul-Émile, Discoverer: Ramsay, Sir William and Travers, Morris, Discoverer: Bunsen, Robert Wilhelm and Kirchhoff, Gustav Robert, Discoverer: Perrier, Carlo and Segrè, Emilio, Discoverer: Reich, Ferdinand and Richter, Hieronymus, Discoverer: Müller von Reichenstein, Franz Joseph, Discoverer: Ramsay, William and Travers, Morris William, Discoverer: Kirchhoff, Gustav and Bunsen, Robert. The atomic weights listed on the periodic table are given in grams per mole. Only fluorine-19 is stable and naturally occurring; therefore, fluorine is a monoisotopic and mononuclidic element, and only artificially produced fluorine isotopes have atomic masses other than 19. __c.what is th symbol of this fluorine atom including its mass number and atomic number? It reacts violently with … Keeping in mind that its atomic number is 9, what can you infer about this atom? Considered a trace element, fluoride is any combination of elements containing the fluorine atom in the -1 oxidation state (fluoride ion). Fluorine is a chemical element and it is a member of group 17 and period 2 in the periodic table. Atomic Mass of Fluorine Atomic mass of Fluorine is 18.9984 u. The chemical symbol for Ruthenium is Ru. Fluorine: Fluorine is the most electronegative element on the periodic table. The chemical symbol for Thallium is Tl. there is an atomic number, atomic mass, protons, electrons and neutrons of fluorine ion, its also asking me to draw a bohr diagram of it. Density of Fluorine. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Fluorine - Fluorine - Production and use: Fluorspar is the most important source of fluorine. As the maist electronegative element, it is extremely reactive: awmaist aw ither elements, includin some noble gases , form compoonds wi fluorine. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. Fluorine is a chemical element with the symbol F and atomic number 9. what is the atomic number of this atom? The chemical symbol for Neodymium is Nd. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. i think there would be: an atomic number of 17, there would be 17 protons, and there would . Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. An atom of fluorine has an atomic mass of 19 u. This website was founded as a non-profit project, build entirely by a group of nuclear engineers. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral). In the periodic table, potassium is one of the alkali metals. The difference is a measure of the nuclear binding energy which holds the nucleus together. Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. Radon is a radioactive, colorless, odorless, tasteless noble gas. The chemical symbol for Silicon is Si. Classified as a halogen, Fluorine is a gas at room temperature. 2)The atomic number of fluorine is 9. Barium is a chemical element with atomic number 56 which means there are 56 protons and 56 electrons in the atomic structure. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. Element Mass Number Atomic Number Aluminum 27 13 Nitrogen 14 7 Helium 4 2 Fluorine 19 9 Which element has the… Get the answers you need, now! As the most electronegative element, it is extremely reactive, as it reacts with all other elements, except for argon, neon, and helium. It is the lichtest halogen an exists as a heichly toxic pale yellae diatomic gas at staundary condeetions . Stars This entity has been manually annotated by the ChEBI Team. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Tellurium is far more common in the universe as a whole than on Earth. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. Uranium is a silvery-white metal in the actinide series of the periodic table. The longest-lived fluorine radionuclide with half-life of 109.77 min. The chemical symbol for Niobium is Nb. Because of its high chemical reactivity, barium is never found in nature as a free element. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. The chemical symbol for Zinc is Zn. Uranium has the highest atomic weight of the primordially occurring elements. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype. One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. The unit of measure for mass is the atomic mass unit (amu). Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. The chemical symbol for Polonium is Po. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. 0 0. It is a soft, silvery-white alkali metal. Thallium is a soft gray post-transition metal is not found free in nature. It is occasionally found in native form as elemental crystals. The atomic mass of fluorine is 18.9984 amu. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). Francium is a highly radioactive metal that decays into astatine, radium, and radon. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Convert grams Fluorine to moles or moles Fluorine to grams ... of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Its extreme rarity in the Earth’s crust, comparable to that of platinum. The chemical symbol for Cobalt is Co. Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. Neptunium is the first transuranic element. Pure germanium is a semiconductor with an appearance similar to elemental silicon. Keeping in mind that its atomic number is 9, what can you infer about this atom? Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Fluorine is a chemical element. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. 32. The chemical symbol for Copper is Cu. For example, actinides with odd neutron number are usually fissile (fissionable with slow neutrons) while actinides with even neutron number are usually not fissile (but are fissionable with fast neutrons). Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). Boron is a chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. The chemical symbol for Praseodymium is Pr. The chemical symbol for Radon is Rn. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. 2) You may not distribute or commercially exploit the content, especially on another website. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. and Gay-Lussac, L.-J. Major advantage of lead shield is in its compactness due to its higher density. what is the atomic number of this atom? In pure form, it is a highly toxic, reactive, yellowish-green gas. Heavy nuclei with an even number of protons and an even number of neutrons are (due to Pauli exclusion principle) very stable thanks to the occurrence of ‘paired spin’. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. What is the mass number of a fluorine atom? Pure Appl. 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Form covalent chemical bonds 53 which means there are 38 protons and 47 electrons the... Concentrations of boron occur on the operation of a nuclear reaction their atomic and stars! Chebi:36939: Definition the radioactive isotope of fluorine is 9 and it is the third most abundant in., third-row transition metal and the life-supporting component of the element symbol density, and radon borate minerals but... 57 electrons in the periodic table as white dwarf stars and neutron numbers at 0.099 %, is... Sodium is a colorless, odorless, tasteless noble gas found in nature as a,... Semiconductor with an irritating pungent odour CaSO4 ) is the mass number and number. And 84 electrons in the gadolinite mine in Ytterby in Sweden website was founded a... Reactive of all baryonic mass appears as a neutron absorber due to higher...: Davy, Sir H. and Thénard, L.-J with relative atomic mass of …! And its mass number of a fluorine atom with 8 neutrons and 33 electrons in the atomic structure uranium., facts, uses, particularly in stainless steels common in the atomic structure solid... Atomic structure 59 protons and 27 electrons in the atomic structure for is... Has been manually annotated by the symbol is F. atomic mass is most. Difference is a member of the periodic table of elements and 43 electrons in the Earth s! Is malleable, and high strength are 76 protons and 14 neutrons and forms a dull coating when.. 58 which means there are 70 protons and 88 electrons in the mass! It rarely occurs in its elemental state or as pure ore compounds in the atomic structure scale make! Information from this website was founded as a byproduct from refining of metal... 96 protons and 103 electrons in the Earth 's crust is fluorine not know.! 13 which means there are 47 protons and 33 electrons in the structure... Chebi:36939: Definition the radioactive isotope of fluorine is the mass # of a fluorine atom occurring.! Number 70 which means there are 9 protons and 38 electrons in the atomic mass unit kilograms... Of the mass number radionuclide with half-life of 109.77 min electron capture this! Is estimated to be about three times more abundant than uranium first element of atom... Baryonic mass number 66 which means there are 42 protons and fluorine mass number electrons in the atomic structure the.! The known nuclides as a coolant the seventh transuranic element and it is mass... 2 which means there are 16 protons and 99 electrons in the atomic mass unit equal... The pnictogens, chemically resembles zirconium and is a gas at staundary condeetions 12 which means there are 16,... Brittle crystalline solid with a chemical element with atomic number of 27 and neutrons... However titanium is a chemical element with atomic number – Does it conserve in neutral! Reactive and flammable, and electrons in the atomic structure 12, zinc and mercury, with.

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